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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Demo</title> | |
| <style> | |
| li.selected { background-color: red; } | |
| </style> | |
| </head> | |
| <body> | |
| <ul id="menu"> | |
| <li>Item one</li> | |
| <li>Item two</li> | |
| <li>Item three</li> | |
| <li class="selected">Item four</li> | |
| <li>Item five</li> | |
| </ul> | |
| <script> | |
| document.addEventListener("DOMContentLoaded", init, false); | |
| function init() { | |
| //remove the selected class from the li that has it | |
| document.querySelector("li.selected").classList.remove("selected"); | |
| //get all the LIs | |
| var menuItems = document.querySelectorAll("ul#menu li"); | |
| //How many do we have? | |
| var numItems = menuItems.length; | |
| //Did we have a previous one? | |
| if(window.sessionStorage && window.sessionStorage.getItem("selected")) { | |
| previous = Number(window.sessionStorage.getItem("selected")); | |
| } else { | |
| previous = -1; | |
| } | |
| //Pick one by random | |
| var selected = Math.floor(Math.random()*numItems); | |
| while(selected === previous && numItems > 1) { | |
| selected = Math.floor(Math.random()*numItems); | |
| } | |
| if(window.sessionStorage) window.sessionStorage.setItem("selected", selected); | |
| //And set it | |
| document.querySelector("ul#menu li:nth-child("+(selected+1)+")").classList.add("selected"); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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